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<li><a class="reference internal" href="#">使用 Session 存储数据（Storing data in Session）</a><ul>
<li><a class="reference internal" href="#starting-the-session">启动会话（Starting the Session）</a></li>
<li><a class="reference internal" href="#session-storing-retrieving-data-in-session">Session 的存储与读取（Storing/Retrieving data in Session）</a></li>
<li><a class="reference internal" href="#sessions-removing-destroying-sessions">Sessions 的删除和销毁（Removing/Destroying Sessions）</a></li>
<li><a class="reference internal" href="#isolating-session-data-between-applications">隔离不同应用的会话数据（Isolating Session Data between Applications）</a></li>
<li><a class="reference internal" href="#session-bags">会话袋（Session Bags）</a></li>
<li><a class="reference internal" href="#persistent-data-in-components">组件的持久数据（Persistent Data in Components）</a></li>
<li><a class="reference internal" href="#implementing-your-own-adapters">自定义适配器（Implementing your own adapters）</a></li>
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  <div class="section" id="session-storing-data-in-session">
<h1>使用 Session 存储数据（Storing data in Session）<a class="headerlink" href="#session-storing-data-in-session" title="永久链接至标题">¶</a></h1>
<p><a class="reference internal" href="../api/Phalcon_Session.html"><em>Phalcon\Session</em></a> 组件提供了一种面向对象的方式访问session数据。</p>
<p>使用这个组件替代原生session的原因如下:</p>
<ul class="simple">
<li>在相同域名下的不同应用程序之间，你可以非常容易的隔离session数据</li>
<li>Intercept where session data is set/get in your application</li>
<li>根据应用程序的需要，可以非常方便的更换session适配器</li>
</ul>
<div class="section" id="starting-the-session">
<h2>启动会话（Starting the Session）<a class="headerlink" href="#starting-the-session" title="永久链接至标题">¶</a></h2>
<p>Some applications are session-intensive, almost any action that performs requires access to session data. There are others who access session data casually.
Thanks to the service container, we can ensure that the session is accessed only when it&#8217;s clearly needed:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>

<span class="k">use</span> <span class="nx">Phalcon\Session\Adapter\Files</span> <span class="k">as</span> <span class="nx">Session</span><span class="p">;</span>

<span class="c1">// Start the session the first time when some component request the session service</span>
<span class="nv">$di</span><span class="o">-&gt;</span><span class="na">setShared</span><span class="p">(</span>
    <span class="s2">&quot;session&quot;</span><span class="p">,</span>
    <span class="k">function</span> <span class="p">()</span> <span class="p">{</span>
        <span class="nv">$session</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Session</span><span class="p">();</span>

        <span class="nv">$session</span><span class="o">-&gt;</span><span class="na">start</span><span class="p">();</span>

        <span class="k">return</span> <span class="nv">$session</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="session-storing-retrieving-data-in-session">
<h2>Session 的存储与读取（Storing/Retrieving data in Session）<a class="headerlink" href="#session-storing-retrieving-data-in-session" title="永久链接至标题">¶</a></h2>
<p>控制器，视图或者任何继承于 <a class="reference internal" href="../api/Phalcon_Di_Injectable.html"><em>Phalcon\Di\Injectable</em></a> 的组件，都可以访问session服务。
如下示例介绍了session的存储与读取操作:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>

<span class="k">use</span> <span class="nx">Phalcon\Mvc\Controller</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">UserController</span> <span class="k">extends</span> <span class="nx">Controller</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">indexAction</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// 设置一个session变量</span>
        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">session</span><span class="o">-&gt;</span><span class="na">set</span><span class="p">(</span><span class="s2">&quot;user-name&quot;</span><span class="p">,</span> <span class="s2">&quot;Michael&quot;</span><span class="p">);</span>
    <span class="p">}</span>

    <span class="k">public</span> <span class="k">function</span> <span class="nf">welcomeAction</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// 检查session变量是否已定义</span>
        <span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">session</span><span class="o">-&gt;</span><span class="na">has</span><span class="p">(</span><span class="s2">&quot;user-name&quot;</span><span class="p">))</span> <span class="p">{</span>
            <span class="c1">// 获取session变量的值</span>
            <span class="nv">$name</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">session</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s2">&quot;user-name&quot;</span><span class="p">);</span>
        <span class="p">}</span>
    <span class="p">}</span>

<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="sessions-removing-destroying-sessions">
<h2>Sessions 的删除和销毁（Removing/Destroying Sessions）<a class="headerlink" href="#sessions-removing-destroying-sessions" title="永久链接至标题">¶</a></h2>
<p>你也可以删除某个session变量，或者销毁全部session会话:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>

<span class="k">use</span> <span class="nx">Phalcon\Mvc\Controller</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">UserController</span> <span class="k">extends</span> <span class="nx">Controller</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">removeAction</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// 删除session变量</span>
        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">session</span><span class="o">-&gt;</span><span class="na">remove</span><span class="p">(</span><span class="s2">&quot;user-name&quot;</span><span class="p">);</span>
    <span class="p">}</span>

    <span class="k">public</span> <span class="k">function</span> <span class="nf">logoutAction</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// 销毁全部session会话</span>
        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">session</span><span class="o">-&gt;</span><span class="na">destroy</span><span class="p">();</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="isolating-session-data-between-applications">
<h2>隔离不同应用的会话数据（Isolating Session Data between Applications）<a class="headerlink" href="#isolating-session-data-between-applications" title="永久链接至标题">¶</a></h2>
<p>Sometimes a user can use the same application twice, on the same server, in the same session. Surely, if we use variables in session,
we want that every application have separate session data (even though the same code and same variable names). To solve this, you can add a
prefix for every session variable created in a certain application:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>

<span class="k">use</span> <span class="nx">Phalcon\Session\Adapter\Files</span> <span class="k">as</span> <span class="nx">Session</span><span class="p">;</span>

<span class="c1">// Isolating the session data</span>
<span class="nv">$di</span><span class="o">-&gt;</span><span class="na">set</span><span class="p">(</span>
    <span class="s2">&quot;session&quot;</span><span class="p">,</span>
    <span class="k">function</span> <span class="p">()</span> <span class="p">{</span>
        <span class="c1">// All variables created will prefixed with &quot;my-app-1&quot;</span>
        <span class="nv">$session</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Session</span><span class="p">(</span>
            <span class="p">[</span>
                <span class="s2">&quot;uniqueId&quot;</span> <span class="o">=&gt;</span> <span class="s2">&quot;my-app-1&quot;</span><span class="p">,</span>
            <span class="p">]</span>
        <span class="p">);</span>

        <span class="nv">$session</span><span class="o">-&gt;</span><span class="na">start</span><span class="p">();</span>

        <span class="k">return</span> <span class="nv">$session</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">);</span>
</pre></div>
</div>
<p>Adding a unique ID is not necessary.</p>
</div>
<div class="section" id="session-bags">
<h2>会话袋（Session Bags）<a class="headerlink" href="#session-bags" title="永久链接至标题">¶</a></h2>
<p><a class="reference internal" href="../api/Phalcon_Session_Bag.html"><em>Phalcon\Session\Bag</em></a> is a component that helps separating session data into &#8220;namespaces&#8221;.
Working by this way you can easily create groups of session variables into the application. By only setting the variables in the &#8220;bag&#8221;,
it&#8217;s automatically stored in session:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>

<span class="k">use</span> <span class="nx">Phalcon\Session\Bag</span> <span class="k">as</span> <span class="nx">SessionBag</span><span class="p">;</span>

<span class="nv">$user</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">SessionBag</span><span class="p">(</span><span class="s2">&quot;user&quot;</span><span class="p">);</span>

<span class="nv">$user</span><span class="o">-&gt;</span><span class="na">setDI</span><span class="p">(</span><span class="nv">$di</span><span class="p">);</span>

<span class="nv">$user</span><span class="o">-&gt;</span><span class="na">name</span> <span class="o">=</span> <span class="s2">&quot;Kimbra Johnson&quot;</span><span class="p">;</span>
<span class="nv">$user</span><span class="o">-&gt;</span><span class="na">age</span>  <span class="o">=</span> <span class="mi">22</span><span class="p">;</span>
</pre></div>
</div>
</div>
<div class="section" id="persistent-data-in-components">
<h2>组件的持久数据（Persistent Data in Components）<a class="headerlink" href="#persistent-data-in-components" title="永久链接至标题">¶</a></h2>
<p>Controller, components and classes that extends <a class="reference internal" href="../api/Phalcon_Di_Injectable.html"><em>Phalcon\Di\Injectable</em></a> may inject
a <a class="reference internal" href="../api/Phalcon_Session_Bag.html"><em>Phalcon\Session\Bag</em></a>. This class isolates variables for every class.
Thanks to this you can persist data between requests in every class in an independent way.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>

<span class="k">use</span> <span class="nx">Phalcon\Mvc\Controller</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">UserController</span> <span class="k">extends</span> <span class="nx">Controller</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">indexAction</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// Create a persistent variable &quot;name&quot;</span>
        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">persistent</span><span class="o">-&gt;</span><span class="na">name</span> <span class="o">=</span> <span class="s2">&quot;Laura&quot;</span><span class="p">;</span>
    <span class="p">}</span>

    <span class="k">public</span> <span class="k">function</span> <span class="nf">welcomeAction</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="k">if</span> <span class="p">(</span><span class="nb">isset</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">persistent</span><span class="o">-&gt;</span><span class="na">name</span><span class="p">))</span> <span class="p">{</span>
            <span class="k">echo</span> <span class="s2">&quot;Welcome, &quot;</span><span class="p">,</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">persistent</span><span class="o">-&gt;</span><span class="na">name</span><span class="p">;</span>
        <span class="p">}</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>In a component:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>

<span class="k">use</span> <span class="nx">Phalcon\Mvc\Controller</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">Security</span> <span class="k">extends</span> <span class="nx">Component</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">auth</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// Create a persistent variable &quot;name&quot;</span>
        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">persistent</span><span class="o">-&gt;</span><span class="na">name</span> <span class="o">=</span> <span class="s2">&quot;Laura&quot;</span><span class="p">;</span>
    <span class="p">}</span>

    <span class="k">public</span> <span class="k">function</span> <span class="nf">getAuthName</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">persistent</span><span class="o">-&gt;</span><span class="na">name</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The data added to the session (<code class="code docutils literal"><span class="pre">$this-&gt;session</span></code>) are available throughout the application, while persistent (<code class="code docutils literal"><span class="pre">$this-&gt;persistent</span></code>)
can only be accessed in the scope of the current class.</p>
</div>
<div class="section" id="implementing-your-own-adapters">
<h2>自定义适配器（Implementing your own adapters）<a class="headerlink" href="#implementing-your-own-adapters" title="永久链接至标题">¶</a></h2>
<p>The <a class="reference internal" href="../api/Phalcon_Session_AdapterInterface.html"><em>Phalcon\Session\AdapterInterface</em></a> interface must be implemented in order to create your own session adapters or extend the existing ones.</p>
<p>There are more adapters available for this components in the <a class="reference external" href="https://github.com/phalcon/incubator/tree/master/Library/Phalcon/Session/Adapter">Phalcon Incubator</a></p>
</div>
</div>


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